Choose hydraulic pumps, these factors can not be ignored

The choice of hydraulic pump should not only consider the pressure, flow, volume, cost, other aspects are also very important. System compatibility of compatible hydraulic pump, and reliability and life prediction of pump. Experience shows that the screw pump pressure is very economical when it is 2~3MPa. And the pump is quieter without pulsation and has high reliability in the case of moderate viscosity.

In addition, the noise and pressure pulsation of the vane pump is relatively small, which is more suitable than the external gear pump in the case of suitable pressure, and the total efficiency is lower than that of the piston pump.

When the internal gear pump is used in medium and high pressure, the noise is very low, the life expectancy is 20000h, and the volumetric efficiency is 97%. But the internal gear pump is more expensive than the external gear pump.

For the use of low pressure, medium and high pressure, in terms of its economy, the external gear pump is cheaper than other pumps, but with the increase of pressure and the extension of the use time, the noise value will increase sharply.

The radial piston pump has a longer life expectancy and can be applied to high voltage occasions. When the working pressure of axial piston pump is 20~25Mpa, its life expectancy is 40000h, and when the working pressure is 30~35Mpa, the service life will be reduced to less than 15000h.

Overall considerations

When selecting hydraulic pump, the designers of hydraulic system and the maintenance personnel of hydraulic system must understand and consider the basic factors:

1. Full pressure and system maximum working pressure;

2. Allowable rotational speed of hydraulic pump;

3. Characteristics of hydraulic pump calibration;

4. The flow required by the hydraulic system;

5, pressure, speed, flow of the relationship;

6, the adaptability of variable control;

7. Endurance of pressure shock;

8, the degree of leakage loss;

9, volumetric efficiency and total efficiency;

10, pollution tolerance;

11. Reliability and durability of operation;

12. Life expectancy under various loads and speeds;

13. Characteristics of oil and its relation to wear rate of hydraulic pump;

14. The noise produced by hydraulic pump running under different pressure, speed and flow;

15, the hydraulic system and the maintainability of temperature;

16. Maintenance and availability of spare parts;

17. Filtration requirements;

18, drive form and installation method;

19. Special coating on sliding surface;

20. Oil absorption condition;

21, manufacturing characteristics, parts clearance and coordination; 22 compactness and power density; 23 compatibility, cost and economic factors of the whole system.

The above factors in the selection of pumps should be considered one by one, so that it has the appropriate adaptability, hydraulic pumps in the system can operate reliably, otherwise there will be a variety of faults.

At the same time, we must also understand the scope of the use of various hydraulic pumps, in order to use, adjust and maintain operation.

Comprehensive factors show that: from the aspects of performance and cost considerations, in general, spend a minimum of common gear pump internal gear pump, vane pump screw pump is expensive, Binet gear and vane pumps are expensive, piston pump is more expensive than other pumps; requirements for low pressure conditions, advantages of rotary pump plunger pump the multi.

(focus on more information, plus QQ:2058359917)

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